import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'

export default {
  install(Vue, options) {
    Vue.prototype.getPdf = function () {
      let title = `123`  //DPF标题
      html2Canvas(document.querySelector('#pdfPrint'), {
        allowTaint: true,
        taintTest: false,
        useCORS: true,
        y: 0, // 对Y轴进行裁切
        x: 0, // 对x轴进行裁切
        // width:1200, 设置宽度
        // height:5000, 设置高度
        dpi: window.devicePixelRatio * 4, //将分辨率提高到特定的DPI 提高四倍
        scale: 4 //按比例增加分辨率
      }).then(function (canvas) {
        let contentWidth = canvas.width
        let contentHeight = canvas.height
        let pageHeight = contentWidth / 592.28 * 841.89
        let leftHeight = contentHeight
        let position = 0
        let imgWidth = 595.28
        let imgHeight = 592.28 / contentWidth * contentHeight
        let pageData = canvas.toDataURL('image/jpeg', 1.0)
        let PDF = new JsPDF('', 'pt', 'a4')
        if (leftHeight < pageHeight) {
          PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
        } else {
          while (leftHeight > 0) {
            PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
            leftHeight -= pageHeight
            position -= 841.89
            if (leftHeight > 0) {
              PDF.addPage()
            }
          }
        }
        PDF.save(title + '.pdf')
      })
    }
  }
}
